Zynga's announced details of its new rewards scheme for its games, known as RewardVille.
The scheme has three levels: zPoints, zCoins and zLevels. Basically, you'll earn more points the more you play Zynga games like FarmVille or CityVille.
You can use these points once you reach a certain level to trade in for virtual goods for the games that you would probably have to buy with real money.
There's been no official announcement on this as yet, but, as you can see, a RewardVille site is now live.